> On 03/16/2012 02:50 PM, Du, Alek wrote:>> For #1, as I said, we already held the tty refcount. The tty refcount cannot help this crash.> > Where exactly? Do you have some local changes?> $ grep tty_port_tty_ drivers/tty/serial/mfd.c> $

Yes, we do have local changes not upstream yet. But you should know now, TTY recount is not the key of the spin lock hole.